BMCU Lite | Rewind upgrade KIT

 BMCU Lite spool rewinder upgrade KIT

     NOW, BMCU lite can be used in A1 and P1 series!!!

 BOM:

• N20 motor with dual shaft 12V 53RPM 4pc  (It is important with these parameters)
  Link: https://a.aliexpress.com/_EI0jucU (It has the best price for my region (Ukraine)) 
• Rubber Ring 25x10 mm. Need 16pc, but it's better to buy more, for example 50 pc
  Link: https://a.aliexpress.com/_EG0hpYY 
• Schottky diode (Діод Шоткі) 1.5A 24V+ or bigger, 4 pc

     Rewinding is fully fully controlled by the main BMCU board. N20 motors can be a bit noisy, but I can't compare them to the original AMS.
When there is little filament left on the spool, the N20 motor may sometimes start. It does not affect the operation, it is simply related to the working principle of the BMCU. I have not found a solution to remove it yet.

     When printing, the motor does not move, so the spool slides on rubber rings. They do not wear out, but it is better to have them in reserve, so that in case of need they can be replaced after 2000 hours of printing. If necessary)
 
Schematic example for motor №4

     IF MOTOR rotating in wrong way, change the polarity of the motor (connect the wires the other way around, minus to the diode)

     This rewind system is max low cost and do not  require any other modules for control.

    Assembling, see photo:

Lubricate motor gears!!

Screws m1.2x6 - 16pc

Screws m2 from BMCU Kit 8pc

Wiring:

• It goes to two sides, motor 1-2 to L, 3-4 to R. For motors 3-4 you should drill a small hole in box, or if wires are so long, you can make it in another way (shown in the photo below)
• It is not shown in the photo, but the wires need to be routed inside the printed parts.

Screw m2 4pc from BMCU Kit

Channel 2 on the housing was intended for LED strip or for wiring.